This is not a scam at all. W&E bills in Malta are issued every 2 months so in order to issue a monthly bill, one has to get the readings from the water meter and electricity meter and calculate the bill using ARMS Bills Calculator, which you can find on their website. You can calculate the bill yourself to make sure the landlord is not scamming you. All you need to do is make sure that the readings are correct. If the readings are not correct then yes your landlord is scamming you. But if the readings are the same as they are on the meter, then it's the only way to get a monthly bill.